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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fd0a16f31501f57bf2b92d83e3c65804e63e90e4d8ff2a9e5df714bee3152d' 
  AND token = '/G5xj2AFZwa6GIlqfRiEC0Vkforn7+QfU6+Lork0IP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}